.page-about {
  --ab-gap: clamp(28px, 5vw, 56px);
  --ab-notch: 16px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(26px, 5vw, 52px);
  padding-bottom: clamp(34px, 6vw, 72px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .about-hero__lead {
  position: relative;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.04;
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  color: var(--cream);
}

.page-about .about-hero__note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--smoke);
}

.page-about .about-hero__lede {
  margin-top: 0;
}

.page-about .about-hero__body p {
  color: var(--body-text);
  line-height: 1.8;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
  animation: about-flash 1.2s var(--ease) 240ms both;
}

.page-about .about-stat__unit {
  margin-left: 2px;
  font-size: 0.5em;
  color: var(--amber-lt);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--smoke);
}

@keyframes about-flash {
  0% {
    color: var(--amber-lt);
    text-shadow: 0 0 20px rgba(232, 163, 61, 0.55);
  }
  100% {
    color: var(--amber);
    text-shadow: none;
  }
}

/* ---------- 主体：侧栏目录 + 正文 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 34px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 8px;
  margin: 0;
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}

.page-about .about-toc::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc__title {
  display: none;
}

.page-about .about-toc .toc__link {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--smoke);
  font-size: 0.84rem;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc .toc__link:hover {
  color: var(--cream);
  border-color: var(--amber);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-section__idx {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-section__head .h2 {
  margin: 0;
  color: var(--cream);
}

.page-about .about-section__content p {
  margin: 0 0 16px;
  color: var(--body-text);
  line-height: 1.82;
}

.page-about .about-section__content p:last-child {
  margin-bottom: 0;
}

.page-about .about-section__content--tail {
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px !important;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--coverage {
  margin-top: 0;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 28px 28px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 12px;
  bottom: -4px;
  width: 1px;
  background: linear-gradient(var(--line), rgba(27, 58, 87, 0.15));
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(232, 163, 61, 0.16);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item:last-child::before {
  display: none;
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-num);
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber-lt);
  margin-bottom: 5px;
}

.page-about .timeline__title {
  margin: 0 0 7px;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--cream);
  line-height: 1.5;
}

.page-about .timeline__body p {
  margin: 0;
  color: var(--body-text);
  font-size: 0.94rem;
  line-height: 1.75;
}

.page-about .about-figure--timeline {
  margin-top: clamp(26px, 4vw, 40px);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .team-card {
  position: relative;
  padding: 24px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--ab-notch)) 0, 100% var(--ab-notch), 100% 100%, 0 100%);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(232, 163, 61, 0.55);
  transform: translateY(-3px);
}

.page-about .team-card__n {
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .team-card__name {
  margin: 0 0 10px;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .team-card p {
  margin: 0;
  color: var(--body-text);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .team-card__meta {
  display: block;
  margin-top: 18px;
  padding-top: 13px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--celadon);
}

/* ---------- 服务覆盖 ---------- */
.page-about .coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 34px);
  align-items: start;
}

.page-about .coverage-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .coverage-list li {
  position: relative;
  padding-left: 20px;
  color: var(--body-text);
  font-size: 0.95rem;
  line-height: 1.78;
}

.page-about .coverage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.82em;
  width: 10px;
  height: 2px;
  background: var(--amber);
}

.page-about .coverage-list strong {
  color: var(--cream);
  font-weight: 700;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

.page-about .partner-stat {
  padding: 20px 18px;
  border-left: 3px solid var(--amber);
  background: linear-gradient(135deg, rgba(16, 36, 58, 0.95), rgba(11, 27, 43, 0.55));
}

.page-about .partner-stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 4.4vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .partner-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 0.79rem;
  letter-spacing: 0.05em;
  color: var(--smoke);
}

/* ---------- 行动条 ---------- */
.page-about .about-cta {
  padding-block: clamp(34px, 6vw, 62px);
  background:
    linear-gradient(115deg, rgba(16, 36, 58, 0.96), rgba(5, 11, 18, 0.96)),
    linear-gradient(90deg, var(--amber), var(--cinnabar));
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-cta__text {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.35;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  color: var(--cream);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: 20px;
    align-items: start;
  }

  .page-about .timeline__year {
    margin-bottom: 0;
    padding-top: 3px;
    text-align: right;
  }

  .page-about .timeline__title {
    margin-top: 0;
  }
}

@media (min-width: 860px) {
  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(28px, 5vw, 56px);
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(40px, 6vw, 84px);
  }

  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(36px, 6vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-toc {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0;
    border-bottom: none;
  }

  .page-about .about-toc__title {
    display: block;
    margin: 0 0 14px;
    font-family: var(--font-num);
    font-size: 0.7rem;
    letter-spacing: 0.24em;
    color: var(--amber);
  }

  .page-about .about-toc .toc__link {
    padding: 9px 0 9px 14px;
    border: none;
    border-left: 2px solid var(--line);
    border-radius: 0;
    background: none;
    font-size: 0.88rem;
  }

  .page-about .about-toc .toc__link:hover {
    border-left-color: var(--amber);
    color: var(--cream);
  }

  .page-about .about-toc .toc__link[aria-current] {
    color: var(--amber);
    border-left-color: var(--amber);
    background: linear-gradient(90deg, rgba(232, 163, 61, 0.13), transparent 82%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat__num {
    animation: none;
  }

  .page-about .team-card {
    transition: none;
  }
}